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1. A data storage device for use with a number of host systems including a first-type host system and a second-type host system, comprising: a memory means; a controller for controlling the transfer of data to and from the memory means; a first connector that is configured to interface to a respective first-type host system; and a second connector, separate and distinct from the first connector, that is configured to interface to a respective second-type host system, wherein the controller is configured to selectively allow data supplied by the respective first-type host system via the first connector to be written to the memory means, wherein the controller is configured to allow data stored in the memory means to be accessed by the respective second-type host system via the second connector for presentation of the data on the respective second-type host system, wherein in the case that the data is accessed or supplied by the respective first-type host system via the first connector, the controller is configured to permit reading and writing of data stored in the memory means, and wherein in the case that the data is accessed by the respective second-type host system via the second connector, the controller is configured to permit only reading and deleting of data stored in the memory means.

2. A storage device according to claim 1 , wherein: wherein the controller is configured to selectively allow the data supplied by the respective first-type host system via the first connector to be written to the memory means according to an access code matching process that matches an access code supplied by the respective first-type host system via the first connector to corresponding data associated with the storage device.

3. A storage device according to claim 2 , wherein: the access code is generated when the storage device is connected to the respective first-type host system using the first connector.

4. A storage device according to claim 1 , wherein: the memory means comprises a plurality of memory files which are individually selectable for reading and writing data thereto and therefrom as required by a sleeve which is arranged to rotate to select a desired file.

5. A storage device according to claim 1 , further comprising: a window for admitting wireless signals to one of a plurality of receiver units.

6. A storage device according to claim 5 , wherein: the receiver units are individually presentable to the window using the sleeve.

7. A storage device according to claim 5 , wherein: the receiver units separately correspond with a memory file.

8. A storage device according to claim 7 , wherein: the receiver units are arranged to receive wireless signals for reading and writing data to and from the selected memory file.

9. A storage device according to claim 1 , wherein: the first and second connectors support wired serial connections of different types.

10. A system comprising: the storage device of claim 1 ; a retail host computer that is configured as the first-type host system to allow the retail host computer to interface to the first connector of the storage device to store data representing a transaction receipt in the memory means of the storage device; and a consumer host computer that is configured as the second-type host system to allow the consumer host computer to interface to the second connector of the storage device to access the data representing the transaction receipt as stored in the memory means of the storage device.